diff --git a/CODING_STYLE b/CODING_STYLE
index a579cb1..92036f3 100644
--- a/CODING_STYLE
+++ b/CODING_STYLE
@@ -49,6 +49,9 @@ and is therefore likely to be changed.
Typedefs are used to eliminate the redundant 'struct' keyword. It is the
QEMU coding style.
+When wrapping standard library functions, use the prefix qemu_ to alert
+readers that they are seeing a wrapped version; otherwise avoid this prefix.
+
4. Block structure
Every indented statement is braced; even if the block contains just one